HI Clouds detected towards Virgo with the Arecibo Legacy Fast ALFA Survey

Details HI Clouds detected towards Virgo with the Arecibo Legacy Fast ALFA Survey HI Clouds detected towards Virgo with the Arecibo Legacy Fast ALFA Survey

2007-08-10

arxiv.org/abs/0708.1422v1

Astronomy and Astrophysics

Astrophysics

To appear in Proceedings of IAU Symp #244, "Dark Galaxies and Lost Baryons", June 2007, 10 pages including 7 figures and 1 tab

Scientific paper

10.1017/S1743921307013877

The Arecibo Legacy Fast ALFA survey is in the process of yielding a complete HI dataset of the Virgo Cluster and its environs (Giovanelli et al. 2007, Kent et al., in preparation). Assuming a distance to Virgo of 16.7 Mpc, the minimum detectable HI mass by ALFALFA is of order 2 x 10^7 Msun. A number of the HI detections appear to have interesting properties. Some appear associated with, but offset from, low surface brightness optical counterparts; others, at larger spatial offsets, may be tidally related to optical counterparts. Yet another class includes detections which are not identifiable with any optical counterparts. We present the ALFALFA results on these objects in the Virgo region, as well as followup aperture synthesis observations obtained with the VLA.

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